Suggest to add clear command in grunt to clear the relation variable
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Key: PIG-1423
URL: https://issues.apache.org/jira/browse/PIG-1423
Project: Pig
Issue Type: New Feature
Components: grunt
Affects Versions: 0.8.0
Reporter: Jeff Zhang
Assignee: Jeff Zhang
Fix For: 0.8.0
The relation name in pig script can been considered as variable of programming
language. One risk of the current grunt is that user may use the previous
defined relation name by typo after a long period of work on grunt. And it is
difficult for users to track this problem. E.g. the following red "students"
is not the user intend to use, but here grunt won't throw any error meesage.
students = load 'a.txt';
....
student = load 'b.txt';
result = foreach {color:red}students{color} generate $0;
The clear command is to clear the variable defined before, then if users use
the relation name defined before, grunt will throw error message. And this
command also will be useful to let user reuse the relation names especially
when he's doing lots of experiments for one specific task.
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